Adjust password manager polyfill for form injections (#17830)

src/auth/ha-password-manager-polyfill.ts

@@ -35,20 +35,47 @@ export class HaPasswordManagerPolyfill extends LitElement {
     super.connectedCallback();
     this._styleElement = document.createElement("style");
     this._styleElement.textContent = css`
+      /* Polyfill form is sized and vertically aligned with true form, then positioned offscreen
+      rather than hiding so it does not create a new stacking context */
       .password-manager-polyfill {
         position: absolute;
-        opacity: 0;
-        z-index: -1;
+        box-sizing: border-box;
+      }
+      /* Excluding our wrapper, move any children back on screen, including anything injected that might not already be positioned */
+      .password-manager-polyfill > *:not(.wrapper),
+      .password-manager-polyfill > .wrapper > * {
+        position: relative;
+        left: 10000px;
       }
-      .password-manager-polyfill input {
+      /* Size and hide our polyfill fields */
+      .password-manager-polyfill .underneath {
+        display: block;
+        box-sizing: border-box;
         width: 100%;
-        height: 62px;
-        padding: 0;
+        padding: 0 16px;
         border: 0;
+        z-index: -1;
+        height: 21px;
+        /* Transparency is only needed to hide during paint or in case of misalignment,
+        but LastPass will fail if it's 0, so we use 1% */
+        opacity: 0.01;
+      }
+      .password-manager-polyfill input.underneath {
+        height: 28px;
+        margin-bottom: 30.5px;
+      }
+      /* Button position is not important, but size should not be zero */
+      .password-manager-polyfill > input.underneath[type="submit"] {
+        width: 1px;
+        height: 1px;
+        margin: 0 auto;
+        overflow: hidden;
       }
-      .password-manager-polyfill input[type="submit"] {
-        width: 0;
-        height: 0;
+      /* Ensure injected elements will be on top */
+      .password-manager-polyfill > *:not(.underneath, .wrapper),
+      .password-manager-polyfill > .wrapper > *:not(.underneath) {
+        isolation: isolate;
+        z-index: auto;
       }
     `.toString();
     document.head.append(this._styleElement);
@@ -77,16 +104,25 @@ export class HaPasswordManagerPolyfill extends LitElement {
           class="password-manager-polyfill"
           style=${styleMap({
             top: `${this.boundingRect?.y || 148}px`,
-            left: `calc(50% - ${(this.boundingRect?.width || 360) / 2}px)`,
+            left: `calc(50% - ${
+              (this.boundingRect?.width || 360) / 2
+            }px - 10000px)`,
             width: `${this.boundingRect?.width || 360}px`,
           })}
-          aria-hidden="true"
+          action="/auth"
+          method="post"
           @submit=${this._handleSubmit}
         >
           ${autocompleteLoginFields(this.step.data_schema).map((input) =>
             this.render_input(input)
           )}
-          <input type="submit" />
+          <input
+            type="submit"
+            value="Login"
+            class="underneath"
+            tabindex="-2"
+            aria-hidden="true"
+          />
         </form>
       `;
     }
@@ -99,26 +135,35 @@ export class HaPasswordManagerPolyfill extends LitElement {
       return "";
     }
     return html`
-      <input
-        tabindex="-1"
-        .id=${schema.name}
-        .name=${schema.name}
-        .type=${inputType}
-        .value=${this.stepData[schema.name] || ""}
-        .autocomplete=${schema.autocomplete}
-        @input=${this._valueChanged}
-        @change=${this._valueChanged}
-      />
+      <!-- Label is a sibling so it can be stacked underneath without affecting injections adjacent to input (e.g. LastPass) -->
+      <label for=${schema.name} class="underneath" aria-hidden="true">
+        ${schema.name}
+      </label>
+      <!-- LastPass fails if the input is hidden directly, so we trick it and hide a wrapper instead -->
+      <div class="wrapper" aria-hidden="true">
+        <!-- LastPass fails with tabindex of -1, so we trick with -2 -->
+        <input
+          class="underneath"
+          tabindex="-2"
+          .id=${schema.name}
+          .name=${schema.name}
+          .type=${inputType}
+          .value=${this.stepData[schema.name] || ""}
+          .autocomplete=${schema.autocomplete}
+          @input=${this._valueChanged}
+          @change=${this._valueChanged}
+        />
+      </div>
     `;
   }
 
-  private _handleSubmit(ev: Event) {
+  private _handleSubmit(ev: SubmitEvent) {
     ev.preventDefault();
     fireEvent(this, "form-submitted");
   }
 
   private _valueChanged(ev: Event) {
-    const target = ev.target! as HTMLInputElement;
+    const target = ev.target as HTMLInputElement;
     this.stepData = { ...this.stepData, [target.id]: target.value };
     fireEvent(this, "value-changed", {
       value: this.stepData,